How to Service the Heated Oxygen Sensor on Mercury Mountaineer?

Place the vehicle on a hoist and set neutral before beginning service of the heated oxygen sensor (HO2S). The RH HO2S requires removal of two bolts before setting the heat shield to the side. First disconnect the HO2S electrical connector then apply penetrating and lock lubricant on the connector when needed to aid removal. You must use the exhaust gas oxygen sensor socket to uninstall the oxygen sensor known as HO2S. Before installation you must apply nickel anti-seize lubricant lightly to the threads of the new HO2S before tightening it to 41 Nm (30 lb-ft) using the original socket. Reinstall the HO2S electrical connector afterward before placing the heat shield if needed and fastening it with its 2 bolts at 20 Nm (177 lb-in) torque.

OEM Mercury Mountaineer Oxygen Sensor

Oxygen O2 Sensor

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4 Oxygen Sensors found

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Mercury Mountaineer Oxygen Sensor, Rear Driver Side Part Number: GU2Z-9G444-A
$57.57 MSRP: $94.73
You Save: $37.16 (40%)
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Product Specifications
- Other Name: Sensor - Exhaust Gas - Oxygen; Oxygen Sensor, Front, Front Left, Front Right, Rear, Rear Left, Rear Right
- Position: Rear Driver Side
- Replaces: F1TZ-9F472-A, F85Z-9G444-AA, F88Z-9F472-AA, 1R3Z-9G444-AA, 1R3Z-9G444-BA, DY-1081, F4DZ-9F472-A, 5C5Z-9F472-AA, 5C5Z-9F472-BA, 5F9Z-9G444-BA, 5W6Z-9G444-BA, 6E5Z-9G444-AA, F85Z-9G444-AB, F85Z-9G444-E, F88Z-9F472-AB, 6L7Z-9F472-BA, 5W6Z-9G444-AA, DY-1091, DY-1086, DY-1087, DY-1053, DY-1060, DY-800, DY-831, DY-832, DY-1034, DY-661, DY-731, DY-1040, F4SZ-9F472-A, DY-1057, DY-1104, DY-1039, F1SZ-9F472-B, DY-1038, DY-1089, DY-1093, DY-649, DY-1063, DY-1005, DY-761, F1SZ-9F472-A, DY-703, F3UZ-9F472-A, F4ZZ-9F472-C, F5AZ-9G444-B, F4SZ-9F472-D, F6DZ-9G444-B, F4UZ-9F472-A, F5UZ-9F472-A, F4DZ-9F472-B, F78Z-9F472-AA, F7RZ-9G444-BA, F75Z-9G444-AA, F5WZ-9F472-BA, F6DZ-9G444-AA, F88Z-9F472-BA, F75Z-9G444-BA, F77Z-9F472-BA, F8RZ-9G444-BB, F5MZ-9F472-AA, F78Z-9F472-BA, DY-1058, F6DZ-9G444-EA, FOTZ-9F472-A, XR3Z-9G444-EA, XC2Z-9F472-BA, XR3Z-9G444-JA, XR3Z-9G444-HA, XR3Z-9G444-BB, XC2Z-9F472-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1997-2010 Mercury Mountaineer | Base, Convenience, Eddie Bauer, Elite, Limited, Luxury, Mercury Luxury, Mercury Premier, Mountaineer Version, Premier, XLS, XLT | 4.0L V6, 4.6L V8, 6 Cyl 4.0 L FLEX, 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS, 8 Cyl 5.0 L GAS
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Mercury Mountaineer Oxygen Sensor, Front Passenger Side Part Number: XL3Z-9F472-AA
$66.52 MSRP: $109.45
You Save: $42.93 (40%)
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Right; Rear Oxygen Sensor; Front Oxygen Sensor
- Position: Front Passenger Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2006-2010, 2001 Mercury Mountaineer | Base, Convenience, Luxury, Premier | 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS
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Mercury Mountaineer Oxygen Sensor, Front Driver Side Part Number: XL3Z-9F472-BA
$48.89 MSRP: $77.64
You Save: $28.75 (38%)
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Product Specifications
- Other Name: Sensor - Hego; Oxygen Sensor, Front, Front Left; Front Oxygen Sensor
- Position: Front Driver Side
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2000-2001 Mercury Mountaineer | Base | 6 Cyl 4.0 L GAS, 8 Cyl 5.0 L GAS
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Mercury Mountaineer Oxygen Sensor, Driver Side Part Number: F88Z-9F472-CA
$82.04 MSRP: $111.64
You Save: $29.60 (27%)
ADD TO CART
Product Specifications
- Other Name: Sensor - Hego
- Position: Driver Side
- Replaces: F78Z-9F472-CA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1998-1999 Mercury Mountaineer | Base | 6 Cyl 4.0 L GAS, 8 Cyl 5.0 L GAS

Mercury Mountaineer Oxygen Sensor

OEM Oxygen Sensor boasts unmatched quality. Each part goes through full quality checks. They adhere to Mercury's official factory standards. These steps remove flaws and inconsistencies. So you can get Oxygen Sensor with long life and a perfect fit. Come to our website and find genuine Mercury Mountaineer parts. We keep a wide inventory of OEM Mountaineer parts at the highly affordable prices. It's easy to search, compare, and pick what you need. You'll love the clear info and simple checkout. We offer top-rated customer service, and we reply fast. We also ship promptly to ensure your order arrives on time.

Mercury Mountaineer Oxygen Sensor Parts and Q&A

Oxygen Sensor, Rear Driver Side
GU2Z-9G444-A
Q: How to Service the Heated Oxygen Sensor on Mercury Mountaineer?
A:
Place the vehicle on a hoist and set neutral before beginning service of the heated oxygen sensor (HO2S). The RH HO2S requires removal of two bolts before setting the heat shield to the side. First disconnect the HO2S electrical connector then apply penetrating and lock lubricant on the connector when needed to aid removal. You must use the exhaust gas oxygen sensor socket to uninstall the oxygen sensor known as HO2S. Before installation you must apply nickel anti-seize lubricant lightly to the threads of the new HO2S before tightening it to 41 Nm (30 lb-ft) using the original socket. Reinstall the HO2S electrical connector afterward before placing the heat shield if needed and fastening it with its 2 bolts at 20 Nm (177 lb-in) torque.